Reply to Mix Down/Mastering A DJ Mix in Ableton

I have started doing the mix down process for a mix i have been working on and i have watched a number of very helpful videos but none of them really were directed towards a dj mix rather they were directed towards finishing a track created from scratch. While most of the principals still apply i was wondering how i should place my tracks in the stereo field through out the mix. I am mixing with alot of acapellas on top of heavy bass tracks, so im not sure if the driving bass track should be in the center and have the acapella sitting on the sides of the mix or if it even matters. Any advice on this topic or on the mix in general would be greatly appreciated.
Thanks in advance!